Happy feet

Abby has for some time displayed a rather Pavlovian response to any sort of music. If it's playing, she dances.

Her moves are limited so far.

1) Swaying back and forth while sitting.
2) Swaying back and forth while on hands and knees.

Still, she does them without fail. She can be crawling across a room, and if you happen to kick a toy that belts out a 10-second tune, Abby stops moving and begins swaying.

This is a reasonable demonstration. She doesn't really kick in until near the end, as the camera distracts her a little.